It never ceases to amaze me how the JDK and dotnet core have flipped in their relationship to the software engineering community.
What was once open is closed. What was once closed is open.
What was once open is closed. What was once closed is open.
Oracle JDK is based on it, and Oracle is adding proprietary features so they can make a buck.
Honestly, I'd say the new situation is better than the old. Oracle no longer has the stranglehold over Java that they had since they bought Sun.